feat: add OIDC login support

- Introduced OIDC configuration options in config.example.yaml.
- Added OIDC client initialization and routes for OIDC login, callback, and exchange.
- Implemented OIDC login service to handle user authentication via OIDC.
- Created frontend components for OIDC login and callback handling.
- Updated user creation logic to support OIDC users and their identities.
- Enhanced error handling for OIDC login processes.

internal/services/auth_service_test.go

@@ -381,6 +381,7 @@ func setupAuthServiceTestDB(t *testing.T) *gorm.DB {
 	}
 	if err := db.AutoMigrate(
 		&models.User{},
+		&models.UserIdentity{},
 		&models.Role{},
 		&models.Permission{},
 		&models.UserRole{},